. >> reporter: more than half of the states in america, including new hampshire, have concussion laws to protect student athletes. at eastern tech in maryland, players take brain function tests to determine if and when they can play after an injury. >> it will tell me how severe my injury is, it will tell me how long i have to get back. >> reporter: banning football altogether may be extreme, but butler's proposal has triggered a passionate debate, forcing the country to take a different look at one of its most cherished pastimes. >>> up next on nightly news, the wild brawl that ended with several arrests. it's no happily ever after. why let constipation slow you down? try miralax. mirlax works differently than other laxatives. it draws water into your colon to unblock your system naturally. don't wait to feel great. miralax. >>> tonight the countdown is on. just a couple of hours before the expected launch of the first privately contracted supply mission to the international space station. california-based spacex will attempt to send its drag-in capsule carrying about a thousand poun